Solution and surface photochemistry of fenarimol: A comparative study

Detalhes bibliográficos
Autor(a) principal: Silva, José P. da
Data de Publicação: 2007
Outros Autores: Mateus, M. Conceição D. A., Silva, Abílio M. da, Ferreira, Luís F. Vieira, Burrows, Hugh D.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/5056
https://doi.org/10.1016/j.jphotochem.2006.08.018
Resumo: The photochemistry of the pesticide fenarimol was studied in methanol and on a cellulose surface. The ground state absorption and fluorescence spectra are similar in solution and at the solid/gas interface. Room temperature phosphorescence emission was observed in cellulose. Transient absorption of fenarimol and of its chromophoric units, chlorobenzene and pyrimidine, showed a common absorption band centered at 320 nm in methanol. An absorption band above 350 nm was observed only for fenarimol and was assigned to a recombination intermediate. On cellulose the transient absorption is broader and extends up to 600 nm. The main photodegradation pathway in methanol involves the homolytic cleavage of the bond to the pyrimidyl ring, followed by a fast in-cage recombination of the initially formed pyrimidine and ketyl radicals. On cellulose surfaces, dechlorination is also one of the important photodegradation pathways.
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spelling Solution and surface photochemistry of fenarimol: A comparative studyLaser flash photolysisDiffuse reflectancePhotodegradation productsChlorobenzenePyrimidineThe photochemistry of the pesticide fenarimol was studied in methanol and on a cellulose surface. The ground state absorption and fluorescence spectra are similar in solution and at the solid/gas interface. Room temperature phosphorescence emission was observed in cellulose. Transient absorption of fenarimol and of its chromophoric units, chlorobenzene and pyrimidine, showed a common absorption band centered at 320 nm in methanol. An absorption band above 350 nm was observed only for fenarimol and was assigned to a recombination intermediate. On cellulose the transient absorption is broader and extends up to 600 nm. The main photodegradation pathway in methanol involves the homolytic cleavage of the bond to the pyrimidyl ring, followed by a fast in-cage recombination of the initially formed pyrimidine and ketyl radicals. On cellulose surfaces, dechlorination is also one of the important photodegradation pathways.http://www.sciencedirect.com/science/article/B6TGY-4KSH9VC-5/1/95f111d30a1148f829b59c29c1e78d3c2007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/5056http://hdl.handle.net/10316/5056https://doi.org/10.1016/j.jphotochem.2006.08.018engJournal of Photochemistry and Photobiology A: Chemistry. 186:2-3 (2007) 278-282Silva, José P. daMateus, M. Conceição D. A.Silva, Abílio M. daFerreira, Luís F. VieiraBurrows, Hugh D.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:49:11Zoai:estudogeral.uc.pt:10316/5056Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:34.222941Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Solution and surface photochemistry of fenarimol: A comparative study
title Solution and surface photochemistry of fenarimol: A comparative study
spellingShingle Solution and surface photochemistry of fenarimol: A comparative study
Silva, José P. da
Laser flash photolysis
Diffuse reflectance
Photodegradation products
Chlorobenzene
Pyrimidine
title_short Solution and surface photochemistry of fenarimol: A comparative study
title_full Solution and surface photochemistry of fenarimol: A comparative study
title_fullStr Solution and surface photochemistry of fenarimol: A comparative study
title_full_unstemmed Solution and surface photochemistry of fenarimol: A comparative study
title_sort Solution and surface photochemistry of fenarimol: A comparative study
author Silva, José P. da
author_facet Silva, José P. da
Mateus, M. Conceição D. A.
Silva, Abílio M. da
Ferreira, Luís F. Vieira
Burrows, Hugh D.
author_role author
author2 Mateus, M. Conceição D. A.
Silva, Abílio M. da
Ferreira, Luís F. Vieira
Burrows, Hugh D.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Silva, José P. da
Mateus, M. Conceição D. A.
Silva, Abílio M. da
Ferreira, Luís F. Vieira
Burrows, Hugh D.
dc.subject.por.fl_str_mv Laser flash photolysis
Diffuse reflectance
Photodegradation products
Chlorobenzene
Pyrimidine
topic Laser flash photolysis
Diffuse reflectance
Photodegradation products
Chlorobenzene
Pyrimidine
description The photochemistry of the pesticide fenarimol was studied in methanol and on a cellulose surface. The ground state absorption and fluorescence spectra are similar in solution and at the solid/gas interface. Room temperature phosphorescence emission was observed in cellulose. Transient absorption of fenarimol and of its chromophoric units, chlorobenzene and pyrimidine, showed a common absorption band centered at 320 nm in methanol. An absorption band above 350 nm was observed only for fenarimol and was assigned to a recombination intermediate. On cellulose the transient absorption is broader and extends up to 600 nm. The main photodegradation pathway in methanol involves the homolytic cleavage of the bond to the pyrimidyl ring, followed by a fast in-cage recombination of the initially formed pyrimidine and ketyl radicals. On cellulose surfaces, dechlorination is also one of the important photodegradation pathways.
publishDate 2007
dc.date.none.fl_str_mv 2007
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/5056
http://hdl.handle.net/10316/5056
https://doi.org/10.1016/j.jphotochem.2006.08.018
url http://hdl.handle.net/10316/5056
https://doi.org/10.1016/j.jphotochem.2006.08.018
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Photochemistry and Photobiology A: Chemistry. 186:2-3 (2007) 278-282
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